BD6083GUL_10 Datasheet, PDF (37/46 Pages) Rohm – Multifunction Backlight LED Driver for Small LCD Panels (Charge Pump Type)

BD6083GUL
Technical Note
(7)Convert LED Current
・LED current can be assigned as each of 16 steps of the ambient level.
・Convert LED Current by Min Current setting,Max Current setting,step setting and curbu setting.
Register: IU0
IU1
CRV
STEP [2:0]
Conversion Table (Initial Value)
Ambient
Level
Coefficient
CRV=0 CRV=1
0h
0
0
1h
0.25
1
2h
0.5
2
3h
1
3
4h
1.5
4
5h
2.5
5
6h
3.5
6
7h
5
7
Ambient
Level
8h
9h
Ah
Bh
Ch
Dh
Eh
Fh
Coefficient
CRV=0
CRV=1
6.5
8
8
9
10
10
12
11
13
12
14
13
15
14
16
15
Step Table Setting
STEP[2:0]
000
001
010
011
100
101
110
111
I=ΔI×Coefficient+IU0
※ I≧IU1:I=IU1
※ ΔI×Coefficient
Drop under 1mA
The example of a setting
IU0=4mA
IU1=20mA
ΔI
1.0mA
1.1mA
1.2mA
1.3mA
1.6mA
1.7mA
1.8mA
1.9mA
CRV=0
30
SLP=1mA
SLP=1.1mA
25
SLP=1.2mA
SLP=1.3mA
SLP=1.6mA
20
SLP=1.7mA
SLP=1.8mA
SLP=1.9mA
15
10
5
0
0₀h
3₃h
6₆h
9₉h
Ambient AMLBevel
C₁h₂
F₁h₅
Fig.23
CRV=1
30
SLP=1mA
SLP=1.1mA
25
SLP=1.2mA
SLP=1.3mA
SLP=1.6mA
20
SLP=1.7mA
SLP=1.8mA
SLP=1.9mA
15
10
5
0
0h0
3h3
66h
9h9
C1_C 2h
Fh15
Ambien^At^MBLevel
Fig.24
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2010.07 - Rev.A